diff --git a/compile_osx.sh b/compile_osx.sh
index 8badbc5..d16253b 100755
--- a/compile_osx.sh
+++ b/compile_osx.sh
@@ -4,4 +4,4 @@ CC=~/opt/osxcross/bin/o64-clang
 GCOM=`git  rev-parse --short HEAD`
 
 
-$CC -g3 -O0 -DNO_CLOSE -DGCOM="\"g${GCOM}\"" -o afterburner_osx  src_pc/afterburner.c
+$CC -g3 -O0 -D_OSX_ -DNO_CLOSE -DGCOM="\"g${GCOM}\"" -o afterburner_osx  src_pc/afterburner.c